Why was Luke able to access the following videos?

When Luke was a child, his father applied a parental control to their computer so that he could only access computer programs that were appropriate for his age level. One day, however, Luke’s father found him looking at online videos that used profanity and violence.

because parental control does not filter content on the Internet
because parental control expires after 30 days
because Kenny had turned the parental controls off
because Kenny changed his account